:root{--ink:#241f1b;--orange:#e17f38;--red:#dc2730;--accent:#e17f38;--soft:#fff5ee;--line:#eadccf;--muted:#766b61;--shell:1360px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:78px}body{margin:0;min-width:320px;font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);line-height:1.76;background:#fff}img{display:block;max-width:100%}a{text-decoration:none;color:inherit}.shell{width:min(calc(100% - 56px),var(--shell));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.header-shell{height:74px;display:grid;grid-template-columns:240px 1fr 145px;gap:24px;align-items:center}.brand{display:flex;align-items:center;gap:10px;font-size:9px;font-weight:900;letter-spacing:.13em}.brand img,.app-footer-head img{height:28px;width:auto;background:var(--ink);padding:5px 9px}.site-nav{display:flex;justify-content:center;gap:24px;font-size:12px;font-weight:800;color:var(--muted)}.top-btn{background:var(--orange);color:#fff;padding:10px 14px;text-align:center;font-size:12px;font-weight:900}.menu-button{display:none}.kicker{font-size:10px;font-weight:900;letter-spacing:.15em;color:var(--orange);margin:0 0 12px}
.hero{background:var(--soft)}.hero-shell{display:grid;grid-template-columns:.84fr 1.16fr;gap:70px;align-items:center;padding:75px 0}.hero h1{margin:0;font-size:clamp(56px,7vw,100px);line-height:.93;letter-spacing:-.07em}.hero-copy>p{font-size:18px;color:var(--muted)}.hero-buttons{display:flex;gap:20px;align-items:center;margin-top:28px}.primary{display:inline-flex;background:var(--red);color:#fff;padding:15px 20px;font-weight:900}.hero-buttons>a:last-child{border-bottom:1px solid currentColor;font-size:13px;font-weight:850}.hero img{width:100%;max-height:500px;object-fit:contain;background:#fff}figcaption{margin-top:8px;color:var(--muted);font-size:10px}
.choose,.preview,.touch,.device-strip,.extra,.faq{padding:95px 0}.choose-title{max-width:900px}.choose-title h2,.preview-title h2,.steps-title h2,.touch h2,.device-copy h2,.extra h2,.app-footer-head h2{margin:0;font-size:clamp(34px,4vw,52px);line-height:1.15;letter-spacing:-.045em}.choose-title>p:not(.kicker),.preview-title p:not(.kicker),.steps-title p:not(.kicker),.touch p:not(.kicker),.device-copy p:not(.kicker),.extra p:not(.kicker){color:var(--muted)}
.phone-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:38px}.phone-cards article{min-height:270px;padding:25px;background:#fff;border:1px solid var(--line)}.phone-cards article.android{border-top:6px solid #4da366}.phone-cards article.iphone{border-top:6px solid #222}.phone-cards span{font-size:9px;font-weight:900}.phone-cards h3{font-size:28px;margin:50px 0 8px}.phone-cards p{font-size:11px}.phone-cards a{font-size:11px;font-weight:900}.choose-note{display:flex;justify-content:space-between;gap:25px;align-items:center;margin-top:20px;padding:20px;background:var(--soft)}.choose-note p{margin:0}.choose-note a{background:var(--ink);color:#fff;padding:13px 17px;font-weight:900;white-space:nowrap}
.preview-title{display:grid;grid-template-columns:90px 1fr;gap:25px}.preview-title>span{font-size:52px;font-weight:950;color:#eed8c7}.app-gallery{display:grid;grid-template-columns:1.25fr .75fr;grid-template-rows:1fr 1fr;gap:20px;margin-top:38px}.app-gallery figure{margin:0}.app-gallery .main{grid-row:1/3}.app-gallery img{width:100%;height:100%;object-fit:contain;background:var(--soft)}
.steps{background:var(--soft)}.steps-shell{padding:95px 0}.steps-title{max-width:900px}.step-grid{display:grid;grid-template-columns:repeat(3,1fr);margin-top:35px;border-top:2px solid var(--ink);border-left:1px solid var(--line)}.step-grid article{min-height:205px;padding:20px;background:#fff;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.step-grid b{font-size:28px;color:var(--orange)}.step-grid h3{margin:42px 0 6px}.step-grid p{font-size:11px}.step-btn,.faq-btn{display:inline-flex;margin-top:25px;background:var(--ink);color:#fff;padding:14px 18px;font-weight:900}
.touch,.extra{display:grid;grid-template-columns:1.15fr .85fr;gap:65px;align-items:center}.touch img,.extra img{width:100%;max-height:470px;object-fit:contain;background:var(--soft)}.device-strip{display:grid;grid-template-columns:.85fr 1.15fr;gap:65px;align-items:center;border-top:1px solid var(--line)}.device-strip img{width:100%;max-height:450px;object-fit:contain;background:var(--soft)}.outline{grid-column:1/-1;justify-self:end;display:inline-flex;border:1px solid var(--ink);padding:13px 17px;font-weight:900}.extra{grid-template-columns:.85fr 1.15fr;border-top:1px solid var(--line)}
.faq-list{margin-top:30px;border-top:2px solid var(--ink)}details{border-bottom:1px solid var(--line)}summary{list-style:none;position:relative;padding:20px 45px 20px 0;font-weight:850;cursor:pointer}summary span{position:absolute;right:0}.faq-list p{margin:-3px 0 20px;color:var(--muted)}
.app-footer{background:#251f1b;color:#fff;padding:55px 0 25px}.app-footer-head{display:grid;grid-template-columns:180px 1fr;gap:35px;align-items:center}.app-footer-head span{color:#9c8878;font-size:9px;font-weight:900}.platform-footer{display:grid;grid-template-columns:1fr 1fr 1fr;margin-top:35px;border-top:1px solid #4c433d;border-left:1px solid #4c433d}.platform-footer a{min-height:160px;padding:22px;border-right:1px solid #4c433d;border-bottom:1px solid #4c433d}.platform-footer small{display:block;color:#9d8f85;font-size:8px;font-weight:900}.platform-footer strong{display:block;margin:38px 0 5px;font-size:20px}.platform-footer span{font-size:10px}.platform-footer .android{border-top:5px solid #4da366}.platform-footer .iphone{border-top:5px solid #eee}.platform-footer .all{background:var(--orange);border-top:5px solid var(--orange)}.footer-note{display:flex;justify-content:space-between;gap:20px;padding-top:20px;color:#80736b;font-size:9px}.footer-note p{margin:0;color:#80736b}.mobile-download-bar{display:none}
@media(max-width:850px){.header-shell{grid-template-columns:1fr auto}.site-nav,.top-btn{display:none}.menu-button{display:block}.site-nav.is-open{display:grid;position:absolute;top:70px;left:18px;right:18px;background:#fff;border:1px solid var(--line);padding:12px}.hero-shell,.touch,.device-strip,.extra{grid-template-columns:1fr}.step-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){body{padding-bottom:60px}.shell{width:min(calc(100% - 28px),var(--shell))}.brand span{display:none}.hero-shell{padding:52px 0}.hero h1{font-size:clamp(45px,13vw,62px)}.hero-copy>p{font-size:16px}.hero-buttons{display:grid}.choose,.preview,.touch,.device-strip,.extra,.faq{padding:70px 0}.phone-cards,.app-gallery,.step-grid,.platform-footer{grid-template-columns:1fr;grid-template-rows:auto}.choose-note{display:grid}.preview-title{grid-template-columns:1fr;gap:5px}.app-gallery .main{grid-row:auto}.steps-shell{padding:70px 0}.app-footer-head{grid-template-columns:1fr}.footer-note{display:grid}.outline{justify-self:start;grid-column:auto}.mobile-download-bar{position:fixed;left:0;right:0;bottom:0;height:60px;z-index:90;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:8px 14px}.mobile-download-bar a{background:var(--orange);padding:9px 15px;font-weight:900}}